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If the company spends 100 pounds on advertising, it would spend 0.45 x 100 = 45 pounds on the website.
So, we can write the ratio spent on advertising to the amount spent on its website as 100:45
If we divide both numbers by a same number, we get an equivalent ratio (simplification)
100:45 = (100:5):(45:5) = 20:9
So, the ratio in its simplest form is 20:9